Color print with transparent middle layer.
one file with three color layers
first: black 0.6 mm (starts at 0 mm)
second: transparent 0.6 (starts at 0.8 mm)
third: black 0.6( starts at 1.4 mm)
to make a pair of earrings print:
four times in black : wingTopAndBottom_make2.stl
two times in transparent : wingMiddleTransparent_makeOne.stl
glue them together in the following order: black, transparent, black.